Parameter Value Power 200 W Input Volatge 48 V DC [L.sub.1]/[R.sub.L1] 1.6 mH/0.16 [OMEGA] [L.sub.2] and [L.sub.3]/ 1 mH/0.1 [OMEGA] [R.sub.L2] and [R.sub.L3] [C.sub.1], [C.sub.2] and Co 220 [micro]F [C.sub.3] 22 [micro]F Duty ratio
30 %-90 % Switching Frequency 50 kHz
PWM mode operates with the change of the duty ratio
, and SFM operates with the switching frequency through the TFM controller.
It includes four parts, i.e., current predictive model, delay compensation, voltage vector selection and duty ratio
calculation, and switching sequence producing part.
The control system consists of the controller for the MPPT (Maximum Power Point Tracking) to adjust the duty ratio
D and the controller for PWM (Pulse Width Modulation) to generate the gate signals for transistors [Q.sub.k] (k = 1, 2, ..., N) in the cell converters.
In the equations parameters are D duty ratio
, T switching period, f switching frequency, [V.sub.g] input voltage, [R.sub.L] inductor parasitic resistor, [r.sub.dson] on-state resistance of switching component, [V.sub.L] inductor voltage, [V.sub.C] capacitor and output voltage of converter, [i.sub.C] capacitor current, [I.sub.L] inductor current, [R.sub.Load] load resistor.
Here, the Space vector pulse width modulation technique (SVPWM) is modelled with the computation of three parameters such as switching frequency, duty ratio
, deviation of phase angles in voltage and current.
The influences of the jamming repeat sampling interval [T.sub.s] and the duty ratio
[tau]/[T.sub.s] on the jamming performance of ISRJ have been studied in .
It can been seen from (8) that output electromagnetic damping force of the linear motor, which is irrelevant to initial terminal voltage of the supercapacitor, is proportional to duty ratio
of the switching signal.
TABLE 1: The switching state and corresponding duty ratio
in each segment.
However previous studies focused on pulsed bias voltage N pressure and modulation periods and did not emphasize the influence of duty ratio
is the fraction of time that indicates the active status of a system in a certain period) on the microstructure and properties of these coating.
Thus, the duty ratio
, which is defined as W/L (the distance between adjacent arms), was applied to simplify the problem.